remove JS cruft adding properties to UserRole docs

For any role that is edited / created and then edited again (without re-loading the page) this code was adding a `viewReportList` property to the UserRole couch doc.

Code not used though. Seems to be a hangover from here: https://github.com/dimagi/commcare-hq/commit/a8fc52aa286e27853cb1eacd476e221569f0eba3#diff-d019cf4fde5f7774ba81888a0ea57e94L150